@PeterN_UK In a similar way to Overwatch you can only endorse players you are not grouped up with.
I think introducing negative endorsements could be a tricky thing to do as well as it only antagonises people further, and people that have been a toxic player can hit you back with a negative endorsement even if you're a great player so it's a slippery slope.
That being said, while the endorsements create a preferred list of team-mates you could also have an avoid option in the list that creates almost an invisible negative endorsement that the game knows about but you don't. This don't have a huge effect on the game but just lets you steer clear of that player in the future.
Hopefully the idea of endorsing people and creating a roster of preferred team-mates is incentive enough but also I think having badges and stat trackers that show off your endorsement level could also be fun!
